Update the passthrough command decoder to use the new CHROMIUM_copy_texture.

Clean up the extension spec to not use GL prefixes.

Fix the missmatch between using GLuint and GLenum for texture IDs.

Roll ANGLE 4063e20..795e757
https://chromium.googlesource.com/angle/angle.git/+log/4063e20..795e757

BUG=612542
BUG=angleproject:1932
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2776753002
Cr-Original-Commit-Position: refs/heads/master@{#460105}
Committed: https://chromium.googlesource.com/chromium/src/+/e8f6d1aee5378201806dcf6c0dc4fde3dabb60a1
Review-Url: https://codereview.chromium.org/2776753002
Cr-Commit-Position: refs/heads/master@{#460166}
27 files changed